iOS Documents Directory size limit

Question

I am creating FTP download app that downloads into Documents Directory, and I have simple questions. Does the Documents Directory have size limit and does the download files stay there permanently until the app is removed?

Answer 1

I don't know much about this, I had seen a comment in discussions.apple.com like: There is a limit of 2 GB.

https://discussions.apple.com/message/7599983?messageID=7599983#7599983?messageID=7599983

Files in the document directory stay there permanently until the app is removed.

Answer 2

============EDIT=========

the fact is: 2Gb is the app size limit, and the app's directory can more than 2Gb; I found it from apple doc is here , search keyword "2G"

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I don't know if apple did some change, I use an app named PPTV, it can store videos from server, and more than 2Gb; what happens?

Answer 3

You should use Cache Directory if you want to cache anything without user's action or your app will get rejected if you dont follow the instructions:

http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/PerformanceTuning/PerformanceTuning.html